The goal of this post is just to quickly get GA4 installed on your WordPress site. This post will be nowhere near an exhaustive explanation of what GA4 is or best practices for managing your existing UA (Universal Analytics) and legacy data going forward.
The important thing for you to do as soon as possible is to create your new GA4 property and connect it to your site alongside any existing UA tag you may have. DO NOT delete your existing UA tag yet.
The July 2023 deadline looms, so the sooner you add this to your site and start familiarizing yourself with its reporting, the better.